/*
 * Package il.ac.biu.cs.grossmm.impl.server
 * File ByClassNameLoader.java
 * 
 * This is a part of presence service framework prototype. 
 * See javadoc for more information.
 *  
 * Copyright (C) 2006 Grossmann Mark
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.

 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package il.ac.biu.cs.grossmm.impl.server;

import il.ac.biu.cs.grossmm.api.server.Loader;
import il.ac.biu.cs.grossmm.api.server.Wrapped;
import il.ac.biu.cs.grossmm.api.server.Wrapper;

public class ByClassNameLoader implements Loader {
    
    final Loader fallbackLoader;
    
    public ByClassNameLoader() {
        this(null);
    }
    
    public ByClassNameLoader(Loader fallbackLoader) {
        this.fallbackLoader = fallbackLoader;
    }
    
	public Wrapped load(Wrapper wrapper, Object hint) throws Exception {
		if(! (hint instanceof String) )
            if( fallbackLoader == null)
                throw new IllegalArgumentException("A non-string argument provided: "+hint.getClass());
            else
                return fallbackLoader.load(wrapper, hint);
		
		return wrapper.wrap(Class.forName((String)hint).newInstance());
	}

	public void unload(Wrapped wrapped) {
		/* do nothing */
	}

}
